AI can now generate CD-quality music from text, and it’s only getting better


Think about typing “dramatic intro music” and listening to a hovering symphony or writing “creepy footsteps” and getting high-quality sound results. That is the promise of Secure Audio, a text-to-audio AI mannequin announced Wednesday by Stability AI that may synthesize music or sounds from written descriptions. Earlier than lengthy, comparable expertise could problem musicians for his or her jobs.

If you happen to’ll recall, Stability AI is the corporate that helped fund the creation of Stable Diffusion, a latent diffusion picture synthesis mannequin launched in August 2022. Not content material to restrict itself to producing photographs, the corporate branched out into audio by backing Harmonai, an AI lab that launched music generator Dance Diffusion in September.

Now Stability and Harmonai need to break into industrial AI audio manufacturing with Secure Audio. Judging by production samples, it looks like a big audio high quality improve from earlier AI audio mills we have seen.

On its promotional web page, Stability gives examples of the AI mannequin in motion with prompts like “epic trailer music intense tribal percussion and brass” and “lofi hip hop beat melodic chillhop 85 bpm.” It additionally gives samples of sound results generated utilizing Secure Audio, reminiscent of an airline pilot talking over an intercom and other people speaking in a busy restaurant.

To coach its mannequin, Stability partnered with inventory music supplier AudioSparx and licensed a knowledge set “consisting of over 800,000 audio recordsdata containing music, sound results, and single-instrument stems, in addition to corresponding textual content metadata.” After feeding 19,500 hours of audio into the mannequin, Secure Audio is aware of how you can imitate sure sounds it has heard on command as a result of the sounds have been related to textual content descriptions of them inside its neural community.

A block diagram of the Stable Audio architecture provided by Stability AI.
Enlarge / A block diagram of the Secure Audio structure supplied by Stability AI.

Stablility AI

Secure Audio accommodates a number of elements that work collectively to create custom-made audio shortly. One half shrinks the audio file down in a method that retains its essential options whereas eradicating pointless noise. This makes the system each quicker to show and faster at creating new audio. One other half makes use of textual content (metadata descriptions of the music and sounds) to assist information what sort of audio is generated.

To hurry issues up, the Secure Audio structure operates on a closely simplified, compressed audio illustration to cut back inference time (the period of time it takes for a machine studying mannequin to generate an output as soon as it has been given an enter). In keeping with Stability AI, Secure Audio can render 95 seconds of stereo audio at a 44.1 kHz pattern charge (usually known as “CD high quality”) in lower than one second on an Nvidia A100 GPU. The A100 is a beefy information middle GPU designed for AI use, and it is extra succesful than a typical desktop gaming GPU.

As talked about, Secure Audio is not the primary music generator based mostly on latent diffusion strategies. Final December, we lined Riffusion, a hobbyist tackle an audio model of Secure Diffusion, although its ensuing generations have been removed from Secure Audio’s samples in high quality. In January, Google launched MusicLM, an AI music generator for twenty-four kHz audio, and Meta launched a set of open supply audio instruments (together with a text-to-music generator) known as AudioCraft in August. Now, with 44.1 kHz stereo audio, Secure Diffusion is upping the ante.

Stability says Secure Audio might be obtainable in a free tier and a $12 month-to-month Professional plan. With the free possibility, customers can generate as much as 20 tracks per 30 days, every with a most size of 20 seconds. The Professional plan expands these limits, permitting for 500 observe generations per 30 days and observe lengths of as much as 90 seconds. Future Stability releases are anticipated to incorporate open supply fashions based mostly on the Secure Audio structure, in addition to coaching code for these all in favour of growing audio era fashions.

Because it stands, it is trying like we could be on the sting of production-quality AI-generated music with Secure Audio, contemplating its audio constancy. Will musicians be comfortable in the event that they get changed by AI fashions? Possible not, if historical past has proven us something from AI protests in the visual arts field. For now, a human can simply outclass something AI can generate, however that might not be the case for lengthy. Both method, AI-generated audio could turn into one other instrument in knowledgeable’s audio manufacturing toolbox.

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